This article lists the Message Queue for MQTTthe public request header and public response header of the previous API request.

Common request headers

Common request parameters are request parameters that you must use when you call each API operation.

Parameter Example Required? Additional considerations
Authorization acs <yourAccessKeyId>:<yourSignature> Yes The authentication information used to check the authenticity of a request. Format: AccessKeyId:Signature.
Content-Length 0 Yes The length of the HTTP request body defined in RFC 2616.
Content-Type application/json Yes The type of the HTTP request body defined in RFC 2616.
Content-MD5 0e30656xxxxxxxxx0bc6f70bbdfe Yes The 128-bit MD5 hash value of the request body represented as a Base64 string. We recommend that you specify this parameter for all requests to prevent request tampering.
Date Fri, 16 Aug 2019 11:18:47 GMT Yes The timestamp when a request was sent. Currently, only GMT format is supported. If the difference between the timestamp when the request was sent and the timestamp when the request was received exceeds 15 minutes, the request is deemed invalid.
Host Yes The requested service address, for example:
Accept application/json Yes The return value type required by the client. Valid values: application/json and application/xml.
x-acs-version 10 Yes The API version. The current version 2019-12-11.
x-acs-region-id cn-hangzhou Yes The ID of the region where the target task is located.
x-acs-signature-nonce f63659d4-10ac-483b-99da-ea8fde61eae3 Yes A unique number that is randomly generated to prevent network replay attacks. A different random number is required for each request.
x-acs-signature-method HMAC-SHA1 Yes The signature algorithm. Currently, only HMAC-SHA1 is supported.


GET /pop/v1/wam/appEnv HTTP/1.1
Accept: application/json
UserAgent : Apache-HttpClient/4.5.7 (Java/1.8.0_152)
x-acs-signature-nonce: f63659d4-10ac-483b-99da-ea8fde61eae3
Authorization: acs <yourAccessKeyId>:<yourSignature>
x-acs-signature-version: 1.0
Date: Fri, 16 Aug 2019 11:18:47 GMT
x-acs-signature-method: HMAC-SHA1
Content-Type: application/json; charset=utf-8
X-Acs-Region-Id: cn-hangzhou
Content-Length: 0

Common response headers

Every response returns a unique RequestID regardless of whether the call is successful. Responses can be returned in a unified format. API responses use the HTTP response format where a 2xx status code indicates a successful call and a 4xx or 5xx status code indicates a failed call.

  • XML format
    <? xml version="1.0" encoding="UTF-8"? >
    <!—Result root node-->
    <API Name + Response>
     | <!--Return Request Tag-->
     | <RequestId>4C467B38-3910-447D-87BC-AC049166F216</RequestId>
     | <!--Return Result Data-->
    </API Operation Name+Response>
  • JSON format
        "RequestId": "4C467B38-3910-447D-87BC-AC049166F216"
        /* Response result data */